class_docstr: Class to retrieve IOCs from ThreatStream.com and store them in DynamoDB
code: def excluded_sub_types(self):
      return self._config["excluded_sub_types"]
  
imports: from datetime import datetime, timedelta
  import json
  import backoff
  import boto3
  from botocore.exceptions import ClientError
  import requests
  from streamalert.shared.backoff_handlers import backoff_handler, success_handler, giveup_handler
  from streamalert.shared.config import load_config, parse_lambda_arn
  from streamalert.shared.logger import get_logger
  from streamalert.threat_intel_downloader.exceptions import ThreatStreamCredsError, ThreatStreamLambdaInvokeError, ThreatStreamRequestsError
label_desc: Use image node_id 11 for calling the ThreatStream obj's underlying member method code with example usage: obj.excluded_sub_types() and returns: self